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arXiv 1906.03025hep-thhep-ph
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多重光模下的宇宙学

Cosmology in the presence of multiple light moduli

Bobby S. Acharya, Mansi Dhuria, Diptimoy Ghosh, Anshuman Maharana, Francesco Muia

摘要:

弦/超引力模型中的一般预期是,存在质量达到超对称破缺标度量级的多重模场。我们研究的宇宙学产生的结果真空错位这些模量字段(与以往的研究主要集中在单一的模量的情况下)。我们表明,从较重的模量产生的暗辐射进行了显着的稀释。即使在最轻模量和最重模量的质量之间有一个小的分裂,这种情况也会发生。另一方面,在没有快速湮灭过程的情况下,较重模量的衰变一般会导致暗物质的过度产生。我们讨论的情况下,这个问题可以解决与提示暗物质湮灭暗辐射。这可以导致真实的暗物质丰度,并且只要湮灭是迅速的,由于这种机制而产生的额外暗辐射就会经历足够的稀释。

英文摘要:

The generic expectation in string/supergravity models is that there are multiple moduli fields with masses of the order of the supersymmetry breaking scale. We study the cosmology that arises as a result of vacuum misalignment of these moduli fields (in contrast to previous studies which mostly focussed on the single modulus case). We show that the dark radiation produced from the heavier moduli undergoes significant dilution. This happens even if there is a small splitting between the masses of the lightest and the heavier moduli. On the other hand, in the absence of fast annihilation processes decay of heavier moduli generically leads to overproduction of dark matter. We discuss a scenario where the problem can be addressed with a prompt dark matter annihilation to dark radiation. This can lead to realistic dark matter abundances, and the additional dark radiation produced as a result of this mechanism undergoes sufficient dilution as long as the annihilation is prompt.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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